Zainal Abidin, Mohd Hazreek, et al. “General Relationship Between Field Electrical Resistivity Value (ERV) and Basic Geotechnical Properties (BGP)”. International Journal of Integrated Engineering, vol. 6, no. 1, Sept. 2014, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/849.